/**
 * Copyright (C) 2001 Jonathan Hilliker
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or (at your option) any later version.
 *
 * This library is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
 *
 * Description: 
 *  This class is treated as a winamp styled playlist.  It is essentially a
 *  collection of MP3Files that can be initalised from a file.  Playlists
 *  can also be written based on it's data.
 *
 * @author: Jonathan Hilliker
 * @version: $Id: Playlist.java,v 1.2 2001/10/19 03:57:53 helliker Exp $
 * Revsisions: 
 *  $Log: Playlist.java,v $
 *  Revision 1.2  2001/10/19 03:57:53  helliker
 *  All set for release.
 *
 *
 */

package helliker.id3;

import java.io.*;
import java.util.Iterator;
import java.util.LinkedList;

public class HellikerPlaylist extends LinkedList {

    /**
     * Reads in mp3s from a directory and adds them to the this playlist.  The
     * recurse parameter should be set if you wish to grab mp3s from
     * directories as well.
     *
     * @param dir     the directory to look for mp3s in
     * @param recurse whether or not to recurse subdirectories
     * @throws IOException if the file specified is not a directory
     */
    public void loadFromDirectory(File dir, boolean recurse)
            throws IOException {

        if (dir.isDirectory()) {
            File[] files = dir.listFiles(new MP3FileFilter(true));
            MP3File mp3 = null;

            for (File file : files) {
                if (file.isFile()) {
                    try {
                        mp3 = new MP3File(file);
                        this.add(mp3);
                    }
                    catch (Exception e) {
                        // Do nothing.  Bad mp3, don't add.
                    }
                } else if (recurse) {
                    loadFromDirectory(file, recurse);
                }
            }
        } else {
            throw new IOException("Error loading playlist from a directory: "
                    + dir.getAbsolutePath() + " is not a " +
                    "directory");
        }
    }

    /**
     * Reads from an existing winamp playlist and reads in the files contained
     * in that playlist.
     *
     * @param m3uFile the playlist file
     * @throws PlaylistException     if the file is corrupt
     * @throws FileNotFoundException if an error occurs
     * @throws IOException           if an error occurs
     */
    public void loadFromFile(File m3uFile)
            throws PlaylistException, FileNotFoundException, IOException {

        FileReader in = new FileReader(m3uFile);
        BufferedReader reader = new BufferedReader(in);
        String str = reader.readLine();
        MP3File mp3 = null;

        if (!str.equals("#EXTM3U\r\n")) {
            while ((str = reader.readLine()) != null) {
                if (str.indexOf("EXTINF:") != -1) {
                    str = reader.readLine();

                    try {
                        mp3 = new MP3File(str);
                        this.add(mp3);
                    }
                    catch (Exception e) {
                        // Do nothing, just don't add it
                    }
                } else {
                    throw new PlaylistException();
                }
            }
        } else {
            throw new PlaylistException();
        }

        reader.close();
        in.close();
    }

    /**
     * Creates a winamp styled playlist from the MP3Files contained in this
     * playlist.  If the destination is a directory, then the file will be
     * created in that directory with the same name as the directory with a
     * ".m3u" extension added.  If the destination is a file then the playlist
     * will be saved to that file.
     *
     * @param dest where to save the playlist
     * @throws IOException if an error occurs
     */
    public void writeToFile(File dest) throws IOException {
        File m3u = dest;

        if (dest.isDirectory()) {
            m3u = new File(dest, dest.getName() + ".m3u");
        }

        FileOutputStream out = new FileOutputStream(m3u);
        PrintWriter printer = new PrintWriter(out);
        printer.print(this.toString());
        printer.close();
        out.close();
    }

    /**
     * Return a string representation of this object.  Actually returns the
     * the text as it would be written to a playlist file.
     *
     * @return a string representation of this object
     */
    public String toString() {
//	Collections.sort( this );
        String str = "#EXTM3U\r\n";
        Iterator it = this.iterator();
        MP3File mp3 = null;
        String artist = new String();
        String title = new String();

        while (it.hasNext()) {
            mp3 = (MP3File) it.next();
            str += "#EXTINF:" + mp3.getPlayingTime() + ",";

            try {
                artist = mp3.getArtist();
            }
            catch (ID3v2FormatException e) {
            }

            try {
                title = mp3.getTitle();
            }
            catch (ID3v2FormatException e) {
            }

            if ((artist.trim().length() == 0) ||
                    (title.trim().length() == 0)) {

                artist = mp3.getFileName();
                artist = artist.substring(0, artist.length() - 4);
            }

            str += artist + " - " + title + "\r\n";
            str += mp3.getPath() + "\r\n";
        }

        return str;
    }

} // Playlist
																			